We have a few national parks, but they're not nearly as big or as old as the ones in the US. And there are no more native forests, every one of them has been man made at some point. Within national parks and some other areas, they're trying to let nature take over again but it's a slow process. In one national park (Harz) they've stopped trying to save the spruce trees that were never supposed to be there, and they're all dying from drought, climate change and bark beetles:

https://assets.deutschlandfunk.de/403b1645-9795-4a2c-ad31-43f00c903cb5/1920x1080.jpg

I'm sure something better adapted to the conditions will come in after the spruce is gone, but it's a work in progress.